21421650 has 24 divisors (see below), whose sum is σ = 53126064. Its totient is φ = 5712400.

The previous prime is 21421627. The next prime is 21421657. The reversal of 21421650 is 5612412.

It is not an unprimeable number, because it can be changed into a prime (21421657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71256 + ... + 71555.

It is an arithmetic number, because the mean of its divisors is an integer number (2213586).

Almost surely, 2^21421650 is an apocalyptic number.

21421650 is an abundant number, since it is smaller than the sum of its proper divisors (31704414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21421650 is a wasteful number, since it uses less digits than its factorization.

21421650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142826 (or 142821 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21421650 is about 4628.3528387538. The cubic root of 21421650 is about 277.7267037950.

The spelling of 21421650 in words is "twenty-one million, four hundred twenty-one thousand, six hundred fifty".